Here's another angle. As it turned out, the walls there from the first pour weren't, or got out of square. It turns out I'm still human.

As a result, the slab that capped over was square, and so I had to patch that corner there to fix the unfortunate offset. Not a big deal.

With the hot tub there to hide the imperfect wall, the problem is solved. Also, some brackets were wet set along the side for a fence.